DE102019207317A1 - Process for depositing printed and wet sheets and forming a stack of sheets - Google Patents

Abstract

The invention relates to a method for depositing printed and moist sheets and forming a sheet stack in a delivery of a printing press, comprising the steps: various auxiliary stacks (8); b) placing a plurality of sheets (5) on top of one another and forming a part (7, 7a) of the sheet stack; c) moving an intermediate layer (11) from the auxiliary stack (8) onto the part of the sheet stack (6); and d) placing a plurality of sheets (5) on top of one another and on the intermediate layer (11) and forming a further part (7, 7b) of the sheet stack (6), the intermediate layer (11) between the part (7, 7a) and the further part (7, 7b) of the sheet stack (6) is arranged. The invention advantageously makes it possible to reduce or even to reduce the quality of sheets and / or stacks of sheets caused by moisture and moisture exchange.

Description

The invention relates to a method for depositing printed and moist sheets and forming a sheet stack with the features of claim 1.

Technical field and state of the art

The invention lies in the technical field of the graphic industry and there in particular in the area of printing and depositing sheets e.g. made of paper on a stack of sheets.

When printing on the sheets, moisture can get into the sheets. This moisture can e.g. get into the sheet using applied printing ink, dampening solution, varnish or ink. Due to the moisture introduced, the sheets can expand and shrink again when they dry. In addition, the moisture introduced can cause waves (so-called "curling"). In addition, a sheet stack formed from sheets may have irregularities due to moisture.

A printing method is known from document DE G14257, in which the printed sheets and intermediate sheets are each moved and deposited together as a pair. The stack of sheets formed thus alternately consists of sheets and intermediate sheets. The interleaves are intended to prevent ink from clapping off the back of a next sheet.

From the document DE 602 09 490 T2 A method of manufacturing ink jet recording media is known, wherein a radiation-curing coating is applied to a surface of a substrate material. In this way, a barrier layer against moisture is created on the substrate.

task

It is an object of the invention to provide a method which is improved over the prior art and which, in particular, makes it possible to reduce or even to reduce the quality of sheets and / or stacks of sheets caused by moisture and moisture exchange.

Solution according to the invention

This object is achieved according to the invention by a method with the features of claim 1. Advantageous and therefore preferred developments of the invention result from the subclaims and from the description and the drawings. The features of the invention, the developments of the invention and the exemplary embodiments of the invention also represent advantageous developments of the invention in combination with one another.

1. a) Bereithalten von bogenförmigen und als Feuchtigkeitsbarrieren im Bogenstapel verwendbaren Zwischenlagen auf einem vom Bogenstapel verschiedenen Hilfsstapel;
2. b) Ablegen einer Mehrzahl von Bogen aufeinander und Bilden eines Teils des Bogenstapels;
3. c) Bewegen einer Zwischenlage vom Hilfsstapel auf den Teil des Bogenstapels; und
4. d) Ablegen einer Mehrzahl von Bogen aufeinander und auf die Zwischenlage und Bilden eines weiteren Teils des Bogenstapels, wobei die Zwischenlage zwischen dem Teil und dem weiteren Teil des Bogenstapels angeordnet wird.

The invention relates to a method for depositing printed and moist sheets and forming a stack of sheets in a delivery of a printing press, comprising the steps:

1. a) providing sheet-like intermediate layers which can be used as moisture barriers in the sheet stack on an auxiliary stack different from the sheet stack;
2. b) placing a plurality of sheets on top of one another and forming part of the sheet stack;
3. c) moving an intermediate layer from the auxiliary stack onto the part of the sheet stack; and
4. d) depositing a plurality of sheets on top of one another and on the intermediate layer and forming a further part of the sheet stack, the intermediate layer being arranged between the part and the further part of the sheet stack.

The sheets can e.g. be printed in the ink printing process or in the offset printing process. The ink may preferably be a water-based ink. The sheets can be made of paper, cardboard or cardboard.

The invention advantageously makes it possible to reduce or even to reduce the quality of sheets and / or stacks of sheets caused by moisture and moisture exchange. In particular, disruptive diffusion processes between sheets or partial sheets with different moisture content (and possibly different temperatures) or between sheets or partial sheets and the environment can be reduced or avoided.

An advantage of the invention is that the part and the further part of the sheet stack consist of several sheets. In contrast to the prior art, not half of the sheet stack consists of intermediate layers. This is particularly advantageous when further processing the stack, since the (few) intermediate layers can easily be removed again.

It can be provided in an advantageous manner that an intermediate layer is moved onto the sheet stack when the print subject changes. The amount of moisture in the sheet or in the corresponding part of the sheet stack can change with a changing print subject. In this respect, a moisture barrier between such parts of the sheet stack can be advantageous.

After completion of the method according to the invention, there is at least one intermediate layer in the sheet stack. In this way, the intermediate layer separates a lower part from an upper part of the sheet stack.

Moving the intermediate layer from the auxiliary stack to the part of the sheet stack or introducing the sheets into the sheet stack is automated (i.e. not by hand) and preferably separately, i.e. a single intermediate layer is moved from the auxiliary stack to the stack of sheets alone. In contrast to the prior art, no intermediate layers are moved together with sheets and problems in the common transport are avoided, e.g. disruptive relative movements. The intermediate layers can be lifted off the auxiliary stack with a suction head and moved to the sheet stack with rollers and / or belts. The movement can be supported with blown air. The movement can take place essentially parallel to the sheet transport direction or transversely thereto.

The auxiliary stack can be arranged in the vicinity of the sheet stack. The auxiliary stack can be arranged in the delivery of a printing press like the stack of sheets. The auxiliary stack can alternatively be arranged at another location on the printing press and the intermediate layers can be conveyed from the auxiliary stack to the sheet stack over a transport path. The auxiliary stack can be upstream or downstream of the stack of sheets in the sheet transport direction. Alternatively, the auxiliary stack can also be arranged laterally to the sheet stack, on the so-called drive side or on the so-called operating side of the printing press. Like the sheet stack, the auxiliary stack can be adjustable in height.

The intermediate layer preferably has a closed surface. This closed surface preferably contacts both the sheet located below the intermediate layer and the sheet located above the intermediate layer in the sheet stack. The intermediate layer preferably has no holes, i.e. it is hole-free.

The intermediate layer is preferably essentially a two-dimensional and not a three-dimensional object, in particular not an auxiliary stack carrier e.g. wooden. The intermediate layer has only an insignificant effect on the height of the stack of sheets.

The intermediate layer is preferably based on a sheet of the sheet stack, in particular on the entire surface of the sheet.

The intermediate layer can have a format which corresponds to the format of the sheets in the sheet stack. Alternatively, the intermediate layer can also have a larger format and therefore protrude laterally from the sheet stack. The respective lateral overhang of the intermediate layer can hang down and thereby also protect the stack of sheets laterally against moisture exchange with the surroundings.

Developments of the invention

A preferred development of the invention can be characterized in that the intermediate layer is moved from the auxiliary stack onto the sheet stack at a predetermined point in time. The time can be stored in a computer and the computer can control the movement of the intermediate layer from the auxiliary stack onto the sheet stack. If several intermediate layers are placed in the sheet stack, several times can be specified. The times can define time intervals of a given length. For example, an intermediate layer can be introduced into the sheet stack every 10 or every 30 or every 60 seconds.

A further preferred development of the invention can be characterized in that the intermediate layer is moved from the auxiliary stack to the stack of sheets after a predetermined number of sheets have been deposited on one another. The predetermined number of sheets can be stored as a numerical value in a computer and the computer can control the movement of the intermediate layer from the auxiliary stack onto the stack of sheets. If several intermediate layers are introduced into the sheet stack, several such values can be specified. The parts of the sheet stack formed in this way can have the same height. Alternatively, the height of the parts of the sheet stack can vary. For example, an intermediate layer can be introduced into the sheet stack every 10 or every 50 or every 100 sheets.

A preferred development of the invention can be characterized in that method steps c) and d) are carried out several times, with several intermediate layers being arranged within the sheet stack. In this way e.g. two, three, four or more intermediate layers can be arranged.

A preferred development of the invention can be characterized in that a first intermediate layer is additionally arranged on the underside of the sheet stack. Additionally or alternatively, a last intermediate layer can also be arranged on the top of the sheet stack. In this way, the sheet stack can be protected downwards or upwards against moisture exchange with the environment or with a stacking pallet.

A preferred development of the invention can be characterized in that the movement the intermediate layer from the auxiliary stack to the sheet stack takes place during the flight phase of a sheet to be deposited. The flight phase is preferably that phase between the release of the bow from the gripper closure of a bow-promoting gripper and the impact of the bow on the top of the sheet stack. In this way, damage to the sheet and in particular to a printed image can be prevented. The intermediate layer can advantageously be fed to the sheet stack in such a way that grinding on the upper sheet can be prevented. The space between the top sheet and a sheet to be discarded (in the flight phase) can be used for this. The liner can itself have a flight phase during movement.

A preferred development of the invention can be characterized in that the intermediate layer is a plastic film, e.g. with a thickness of less than 0.5 mm, or a preferably flexible plastic plate, e.g. with a thickness of less than 1 mm. Alternatively, a metallized foil or a metal foil can also be used.

A preferred development of the invention can be characterized in that the intermediate layer or all intermediate layers are / are removed again during the further processing of the sheet stack. Removal can e.g. in the feeder of a folding machine.

A preferred development of the invention can be characterized in that the intermediate layer contacts an arc with its underside and its upper side. In this way it can be prevented that there is a distance between the sheets and the intermediate layer, in particular an air-filled distance.

As an alternative, provision can also be made for the intermediate layer to be introduced into the sheet stream instead of into the delivery sheet stack and to be transported through the printing press to the delivery sheet stack. In this case, the auxiliary stack would preferably be arranged in the vicinity of the feeder. Further alternatively, a sheet stack can be created which is already equipped with at least one intermediate layer at a defined point.

Figures and embodiments of the invention

The invention and its preferred developments are described below with reference to the drawings, ie 1 and 2 , described in more detail using at least one preferred exemplary embodiment.

• 1: eine Seitenansicht einer Druckmaschine während des Ausführens einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens; und
• 2: einen Ablaufplan einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens.

The figures show:

• 1 : a side view of a printing press while executing a preferred embodiment of the method according to the invention; and
• 2 : a flowchart of a preferred embodiment of the method according to the invention.

1 shows a printing press 1 , for example an ink printing machine or an offset printing machine. The printing press includes a delivery arm 2 which is a chain conveyor 3 with grippers 4 for the printed sheets 5 includes. reference numeral 5a shows a transported sheet (in gripper closure) and reference numerals 5b shows a falling bow (bow in flight phase), which on a sheet stack 6 is filed. The sheet stack has an underside 6a and a top 6b on. The sheet stack is on a stack pallet 9 and is preferably adjustable in height. There is an auxiliary stacking pallet near the stacking pallet 10 on which an auxiliary stack 8th from intermediate layers 11 is arranged. The auxiliary stack pallet is also preferably adjustable in height.

According to the inventive method, intermediate layers are 11 (at least one, preferably several intermediate layers) in the sheet stack 6 brought in. In this way, parts of the sheet stack 7 respectively. 7a and 7b generated. It can be seen that the intermediate layers 11 inside the sheet pile 6 and each with its bottom 11a and top 11b adjacent arch 5 to contact. It can also be seen that a first liner 12 on the bottom 6a of the sheet stack 6 can be arranged and that a last liner 13 at the top 6b the sheet stack can be arranged. In the event of the provision of a last liner 13 won't be another bow 5 placed on the sheet stack.

Feeding or moving the intermediate layers 11 takes place with a feed direction 14 which, for example, at least two rollers 15 may include. Controlling the feed direction 14 can be done via a computer 16 the printing press 1 respectively.

In 2 the sequence of a preferred embodiment of the method according to the invention is shown. In process step 20 the intermediate layers are kept ready 11 on the auxiliary pile 8th , In the optional process step 21 becomes a first liner 12 on the bottom 6a of the sheet stack 6 arranged. In process step 22 a plurality of sheets are deposited 5 on top of each other and forming a part 7 respectively. 7a of the sheet stack. In process step 23 an intermediate layer is moved 11 from the auxiliary pile 8th on the part of the sheet stack 6 , In process step 24 a plurality of sheets are deposited 5 on each other and on the liner 11 and forming another part 7 respectively. 7b of the sheet stack 6 , with the liner 11 is arranged between the part and the further part of the sheet stack. The procedural steps 23 and 24 can be carried out several times so that several intermediate layers can be placed in the sheet stack. In the optional process step 25 will be a last stop 13 at the top 6b of the sheet stack 6 arranged. Finally, in the optional step 26 the inserted intermediate layer or the several intermediate layers from the sheet stack 6 be removed again.

LIST OF REFERENCE NUMBERS

1

press

2

boom

3

chain conveyors

4

grab

5

arc

5a

transported bow

5b

falling bow (flight phase)

6

sheet pile

6a

Bottom of the sheet stack

6b

Top of the sheet stack

7

Part / parts of the sheet stack

7a

Part / parts of the sheet stack

7b

Part / parts of the sheet stack

8th

waste pile

9

stacking pallet

10

Auxiliary stacking pallet

11

liner

11a

Bottom of the liner

11b

Top of the liner

12

first liner

13

last liner

14

feeder

15

roll

16

computer

20

Process step ready

21

optional method step arranging a first intermediate layer

22

Step of depositing a plurality of sheets

23

Process step moving an intermediate layer

24

Step of depositing a plurality of sheets

25

Optional step of arranging a last intermediate layer

26

Optional process step removing the intermediate layer

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 60209490 T2 [0005]

Claims (10)

Method for depositing printed and moist sheets and forming a stack of sheets in a delivery of a printing press, comprising the steps: a) providing arched intermediate layers (11) which can be used as moisture barriers in the sheet stack (6) on an auxiliary stack (8) different from the sheet stack (6); b) placing a plurality of sheets (5) on top of one another and forming a part (7, 7a) of the sheet stack; c) moving an intermediate layer (11) from the auxiliary stack (8) onto the part of the sheet stack (6); and d) depositing a plurality of sheets (5) on top of one another and onto the intermediate layer (11) and forming a further part (7, 7b) of the sheet stack (6), the intermediate layer (11) between the part (7, 7a) and the another part (7, 7b) of the sheet stack (6) is arranged. Procedure according to Claim 1 , characterized in that the intermediate layer (11) is moved from the auxiliary stack (8) onto the sheet stack (6) at a predetermined point in time. Procedure according to Claim 1 , characterized in that the intermediate layer (11) is moved from the auxiliary stack (8) onto the sheet stack (6) after a predetermined number of sheets (5) have been deposited on top of one another. Method according to one of the preceding claims, characterized in that method steps c) and d) are carried out several times, with several intermediate layers (11) being arranged within the sheet stack (6). Method according to one of the preceding claims, characterized in that a first intermediate layer (12) is additionally arranged on the underside (6a) of the sheet stack (6). Method according to one of the preceding claims, characterized in that a last intermediate layer (13) is additionally arranged on the upper side (6b) of the sheet stack (6). Method according to one of the preceding claims, characterized in that the movement of the intermediate layer (11) from the auxiliary stack onto the sheet stack (6) takes place during the flight phase of a sheet (5, 5b) to be deposited. Method according to one of the preceding claims, characterized in that the intermediate layer (11) is a plastic film or a plastic plate with a thickness of less than 1 mm. Method according to one of the preceding claims, characterized in that the intermediate layer (11) or all intermediate layers (11) are removed again during the further processing of the sheet stack (6). Method according to one of the preceding claims, characterized in that the intermediate layer (11) contacts with its underside (11a) and its top (11b) in each case an arch (5).

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